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    SubjectRe: Possible memory leak via alloc_pid()
    Oleg Nesterov <oleg@redhat.com> writes:

    > On 07/31, Catalin Marinas wrote:
    >>
    >> On Thu, 2009-07-30 at 23:29 +0200, Oleg Nesterov wrote:
    >> >
    >> > Since you can reproduce the problem easily, perhaps you can use the
    >> > hack above to track get/put ?
    >> >
    >> > $ echo pid_of_Xorg > /proc/sys/kernel/xxx
    >>
    >> Below is the minicom capture. By the time Xorg dies, the count is 2.
    >
    > Thanks a lot Catalin.
    >
    >> When logging out, there are two counter incrementing events via
    >> sys_wait4 and sys_ioctl, thoush I'm not sure whether they are
    >> unbalanced.
    >
    > wait4() is right, ioctl() looks fine too.
    >
    >> pgrep Xorg
    >> 1519
    >> 10:~# pgrep Xorg > /proc/sys/kernel/xxx
    >> XXXXX(1519) ==22
    >
    > Unfortunately there is nothing which looks like a leak. I gueess it is
    > too late to start the tracking.
    >
    > I'm afraid this won't really help too, but since nobody has a better
    > idea for now, perhaps you can do another test?
    >
    > Pleas rename Xorg to Xorg.origin, and make a simple Xorg script which
    > does something like
    >
    > #!/bin/sh
    >
    > echo $$ >> /proc/sys/kernel/xxx
    > exec /path/to/Xorg.origin $*
    >
    > perhaps even this is too late, gdm can do a lot before execing.
    >
    > Please avoid pgrep/ps/etc, proc adds a lot of noise. Better yet, it
    > would be nice to start/stop Xorg with /proc unmounted, but I don't
    > know is this can work without /proc.

    Hmm. I'm starting to wonder if kmemleak is right. I don't know how
    it works but something about the way pids are used might be confusing it.

    Eric


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